removes unused class
Signed-off-by: Sho Nakatani <lay.sakura@gmail.com>
treats shared_ptr bug of libstdc++ (< 4.5.0) w/ -fno-rtti
Signed-off-by: Sho Nakatani <lay.sakura@gmail.com>
pthread_mutex_lock(&mutex) -> std::lock_guard<std::mutex> lock(mutex)
Signed-off-by: Sho Nakatani <lay.sakura@gmail.com>